元组操作

元组是一种序列，它与列表一样，唯一不同的是列表是可修改的，而元组不可以，元组的创建也是较为简单的。

1、元组创建

• 直接使用逗号、圆括号

t=(1,2,3)
print(type(t))#<class 'tuple'>

• 使用关键字tuple

class tuple(object):
    """
    tuple() -> empty tuple
    tuple(iterable) -> tuple initialized from iterable's items
    
    If the argument is a tuple, the return value is the same object.
    """
    def count(self, value): # real signature unknown; restored from __doc__
        """ T.count(value) -> integer -- return number of occurrences of value """
        return 0

    def index(self, value, start=None, stop=None): # real signature unknown; restored from __doc__
        """
        T.index(value, [start, [stop]]) -> integer -- return first index of value.
        Raises ValueError if the value is not present.
        """
        return 0

    def __add__(self, *args, **kwargs): # real signature unknown
        """ Return self+value. """
        pass

    def __contains__(self, *args, **kwargs): # real signature unknown
        """ Return key in self. """
        pass

    def __eq__(self, *args, **kwargs): # real signature unknown
        """ Return self==value. """
        pass

    def __getattribute__(self, *args, **kwargs): # real signature unknown
        """ Return getattr(self, name). """
        pass

    def __getitem__(self, *args, **kwargs): # real signature unknown
        """ Return self[key]. """
        pass

    def __getnewargs__(self, *args, **kwargs): # real signature unknown
        pass

    def __ge__(self, *args, **kwargs): # real signature unknown
        """ Return self>=value. """
        pass

    def __gt__(self, *args, **kwargs): # real signature unknown
        """ Return self>value. """
        pass

    def __hash__(self, *args, **kwargs): # real signature unknown
        """ Return hash(self). """
        pass

    def __init__(self, seq=()): # known special case of tuple.__init__
        """
        tuple() -> empty tuple
        tuple(iterable) -> tuple initialized from iterable's items
        
        If the argument is a tuple, the return value is the same object.
        # (copied from class doc)
        """
        pass

    def __iter__(self, *args, **kwargs): # real signature unknown
        """ Implement iter(self). """
        pass

    def __len__(self, *args, **kwargs): # real signature unknown
        """ Return len(self). """
        pass

    def __le__(self, *args, **kwargs): # real signature unknown
        """ Return self<=value. """
        pass

    def __lt__(self, *args, **kwargs): # real signature unknown
        """ Return self<value. """
        pass

    def __mul__(self, *args, **kwargs): # real signature unknown
        """ Return self*value.n """
        pass

    @staticmethod # known case of __new__
    def __new__(*args, **kwargs): # real signature unknown
        """ Create and return a new object.  See help(type) for accurate signature. """
        pass

    def __ne__(self, *args, **kwargs): # real signature unknown
        """ Return self!=value. """
        pass

    def __repr__(self, *args, **kwargs): # real signature unknown
        """ Return repr(self). """
        pass

    def __rmul__(self, *args, **kwargs): # real signature unknown
        """ Return self*value. """
        pass

t=tuple([1,2,3])
print(type(t))#<class 'tuple'>

注意：如果创建一个元素的元组，后面需要加逗号。

2、元组操作

之前说过元组是一种序列，那么序列的所有特性元组都是可以使用的。那么序列有哪些特性呢？

• 索引取值
• 分片
• 序列相加
• 序列乘法
• in运算符
• 序列内建函数

#索引、切片取值
t=(1,2,3,4,5,)
print(t[1:3])#(2, 3)

#元组相加
t=(1,2,3,4,5,)
t1=('hello',)
print(t+t1)#(1, 2, 3, 4, 5, 'hello')

#元组乘法
t=(1,2,3,4,5,)
print(t*2)#(1, 2, 3, 4, 5, 1, 2, 3, 4, 5)

#in运算符
t=(1,2,3,4,5,)
print(3 in t)#True

#内建函数
t=(1,2,3,4,5,)
print(len(t))#5
print(min(t))#1
print(max(t))#5